docs(intent): the lock a document holds reaches its lines

[delchev]

Companion to eclipse-dirigible/dirigible#6739 (fixes eclipse-dirigible/dirigible#6695).

The DSL reference described a composition child as "a different entity with its own generated controller - which already accepts the writes", presenting as intended what was a hole: a line of an ISSUED invoice could be created, edited or deleted over REST, and because a line write resums the header, that rewrote the document's own totals — after the number was stamped, the immutable PDF snapshot taken and the journal entry posted from them. The generated UI forbade it; the server did not.

Two sections change:

• immutableWhen / immutable gains the paragraph that the lock reaches the document's lines, with the 409 now returned by the child's own controller on every REST surface (power, partner, personal), and the pointer to the opt-out.
• locksWithMaster stops describing the child endpoint as permissive by nature: one declaration governs the affordance and the endpoint together, so the screen and the server cannot disagree, and engine-level writers stay exempt because they go through the repository rather than a controller — which is what keeps flow-generated corrections working.

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